userdebug
or eng
Android build (you can check with adb shell getprop ro.build.type
). Flags cannot be enabled on production builds of Android.WebView reads flags from a specific file during startup. To enable flags, write to the file with:
$ # Overwrites all flags (and prints the new flag state): $ build/android/adb_system_webview_command_line \ --show-composited-layer-borders \ --log-net-log=foo.json # Supports multiple flags $ # Simply prints the existing flag state: $ build/android/adb_system_webview_command_line $ # Passing empty string clears all flags: $ build/android/adb_system_webview_command_line ""
Or, you can use the adb
in your $PATH
like so:
$ FLAG_FILE=/data/local/tmp/webview-command-line $ adb shell "echo '_ --show-composited-layer-borders' > ${FLAG_FILE}" $ # The first token is ignored. We use '_' as a convenient placeholder, but any $ # token is acceptable.
WebView supports the same --enable-features=feature1,feature2
and --disable-features=feature3,feature4
syntax as the rest of Chromium. You can use these like any other flag. Please consult base/feature_list.h
for details.
WebView supports any flags supported in any layer we depend on (ex. content). Some interesting flags and Features:
--show-composited-layer-borders
--enable-features=NetworkService,NetworkServiceInProcess
--log-net-log=<filename.json>
WebView also defines its own flags and Features:
See CommandLineUtil.java.